1  /**

  2     A queen in the eight queens problem.

  3  */

  4  public class Queen

  5  {

  6     private int row;

  7     private int column;

  8  

  9     /**

 10        Constructs a queen at a given position.

 11        @param r the row 

 12        @param c the column

 13     */

 14     public Queen(int r, int c)

 15     {

 16        row = r;

 17        column = c;

 18     }

 19  

 20     /**

 21        Checks whether this queen attacks another.

 22        @param other the other queen

 23        @return true if this and the other queen are in the same

 24        row, column, or diagonal.

 25     */

 26     public boolean attacks(Queen other)

 27     {

 28        return row == other.row

 29           || column == other.column

 30           || Math.abs(row - other.row) == Math.abs(column - other.column);

 31     }

 32  

 33     public String toString() 

 34     { 

 35        return "" + "abcdefgh".charAt(column) + (row + 1) ; 

 36     }

 37  }